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Definition
| depends on luminosity and its distance from earth as expressed by the inverse square law for light |
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Definition
| total amount of light it emits into space (total power output) |
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Definition
doubling the distance to a star would decrease its apparent brightness by a factor of 4
apparent brightness= luminosity/4pie X (distance)^2 |
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Definition
| measures distance by observing how its apparent location shifts as earth or its the sun. |
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| how to measure temperatures of stars |
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Definition
| measure a star's surface temperature from its color or spectrum. |
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Definition
spectral types OBAFGKM hottest to coolest
red= coolest, type M more common than blue= hot, type 0 |
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| How do we measure stellar masses |
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Definition
Newton's version of Kepler's third law
if we know the orbital period and separation of the two stars. |
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Definition
| classification of stars depending on Luminosity and temperature |
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near end of life
Upper right of HR diagram
cooler, but more luminous than the sun |
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Definition
fusion H--> He
placement on graph depends on stellar mass |
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Term
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Definition
stars that are cooling embers of stars that have exhausted their fuels for nuclear fusion
Hot and small |
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